Active Galaxies & Quasars

Active galaxies are ____ than normal galaxies and are

• dimmer, less active

• dimmer, more active

• brighter, less active

• brighter, more active

Active galaxies are also

• very few in number.

• very great in number.

• sprinkled randomly throughout the universe.

• found near the center of the universe.

Active galaxies emit nonstellar material mostly in the ____ portion of the light spectrum.

• infrared

• ultraviolet

• xray

• gamma ray

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

Radio galaxies emit radiation mostly in the _____ portion of the light spectrum.

• infrared

• radio

• xray

• gamma

Tags

NGSS.HS-PS4-3

Seyfert galaxies emit radiation (or light) at both the ____ and ____ part of the spectrum.

• xray, infrared

• xray, radio

• radio, gamma

• radio, visible

Tags

NGSS.HS-PS4-3

Seyfert galaxies are also very bright and have

• small galactic centers.

• large galactic centers.

• many black holes.

• multiple quasars at the center.

Most Seyferts and radio galaxies show this type of structure.

• elliptical with little star formation

• irregular with massive star formation

• spiral with a very bright core-halo region

• spiral with no "bars"

These objects were first found in the 1950's and are among the most distant ever detected.

• supermassive black holes

• quasars

• active galaxies

• supernovae

"Quasar" stands for "quasi-stellar object" or "starlike."

• True

• False

Tags

NGSS.HS-PS4-3

What are thought to cause the tremendous energy produced by quasars?

• supermassive black holes

• supernova explosions

• hypernova explosions

• the Big Bang